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#include <iostream>
#include <fstream>
#include <cstring>
using namespace std;
const size_t MAX_NAME_SIZE = 22;
struct Student
{
//gender should be BEFORE fn so the struct would be 28 bytes.
char name[MAX_NAME_SIZE + 1];
bool isMale;
size_t fn;
};
size_t getFileSize(ifstream& f)
{
size_t currentPos = f.tellg();
f.seekg(0, ios::end);
size_t size = f.tellg();
f.seekg(currentPos);
return size;
}
void readFromFile(Student*& ptr, size_t& studentsCount, ifstream& f)
{
size_t sizeOfFile = getFileSize(f);
studentsCount = sizeOfFile / sizeof(Student);
ptr = new Student[studentsCount];
f.read((char*)ptr, sizeOfFile);
}
int main()
{
Student* arr;
size_t count;
ifstream file("students.dat");
if(!file.is_open())
{
std::cout << "Error while opening the file!" << std::endl;
return -1;
}
readFromFile(arr, count, file);
for (int i = 0; i < count; i++)
std::cout << "Name: " << arr[i].name << ", fn: " << arr[i].fn << ", is male: " << arr[i].isMale << std::endl;
delete[] arr;
return 0;
}
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